Modulated construction of Fe-based MOF via formic acid modulator for enhanced degradation of sulfamethoxazole：Design, degradation pathways, and mechanism

Jian Sun; Jinquan Wan; Yan Wang; Zhicheng Yan; Yongwen Ma; Su Ding; Min Tang; Yongchang Xie

doi:10.1016/j.jhazmat.2022.128299

Modulated construction of Fe-based MOF via formic acid modulator for enhanced degradation of sulfamethoxazole：Design, degradation pathways, and mechanism

J Hazard Mater. 2022 May 5:429:128299. doi: 10.1016/j.jhazmat.2022.128299. Epub 2022 Jan 17.

Authors

Jian Sun¹, Jinquan Wan², Yan Wang³, Zhicheng Yan¹, Yongwen Ma⁴, Su Ding⁵, Min Tang¹, Yongchang Xie¹

Affiliations

¹ School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
² School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; Sino-Singapore International Joint Research Institute, Guangzhou 510006, China; Guangdong Plant Fiber High-Valued Cleaning Utilization Engineering Technology Research Center, Guangzhou 510006, China. Electronic address: ppjqwan@scut.edu.cn.
³ School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; Guangdong Plant Fiber High-Valued Cleaning Utilization Engineering Technology Research Center, Guangzhou 510006, China.
⁴ School of Environment and Energy, South China University of Technology, Guangzhou 510006, China; Sino-Singapore International Joint Research Institute, Guangzhou 510006, China; Guangdong Plant Fiber High-Valued Cleaning Utilization Engineering Technology Research Center, Guangzhou 510006, China.
⁵ School of Environmental and Bioengineering, Henan University of Engineering, No. 1 Xianghe Road, Zhengzhou 451191, China.

PMID: 35077971
DOI: 10.1016/j.jhazmat.2022.128299

Abstract

Metal-organic frameworks (MOFs) have attracted more attention because of their excellent environmental catalytic capabilities. Modulation approach as an advanced assistant strategy is vital essential to enhancing the performance of MOFs. In this study, the modulated method was used to successfully synthesize a group of Fe-based MOFs, with formic acid as the modulator on the synthesis mixture. The most modulated sample Fe-MOFs-2 exhibit high specific surface areas and higher catalytic activity, which could effectively degrade SMX via PS activation, with almost 95% removal efficiency within 120 min. The results revealed that the % RSE of modulated Fe-MOFs-2 increased from 2.31 to 3.27 when compared with the origin Fe-MOFs. This may be due to the addition of formic acid induces the formation of more coordinatively unsaturated metal sites in the catalyst, resulting in structural defects. In addition, the quenching experiment and EPR analysis verified SO₄^-·and·OH as the major active free radicals in the degradation process. Modulated Fe-MOFs-2 demonstrated good reusability and stability under fifth cycles. Finally, four possible degradation pathways and catalytic mechanism of Fe-MOFs-2 was tentatively proposed. Our work provides insights into the rational design of modulated Fe-MOFs as promising heterogeneous catalysts for advanced wastewater treatment.

Keywords: Advanced oxidation technology; Metal-organic frameworks; Modulator; Persulfate; Sulfamethoxazole.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Catalysis
Formates
Metal-Organic Frameworks*
Sulfamethoxazole
Water Purification*

Substances

Formates
Metal-Organic Frameworks
formic acid
Sulfamethoxazole